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CHAPTER 4 EXTENDING MSBUILD
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_buildElements.Push(buildElement); _buildTypeList.Push(BuildType.Build); } This handler will create a new Build element and attach it to the MSBuild element. It will always add two attributes, one for the start time and one describing the current verbosity level. Following this, if the verbosity is set to at least Detailed, then an element will be created that contains all of the logger parameters and their values. The Microsoft.Build.Utilities.Logger abstract class provides the IsVerbosityAtLeast method. You can use this to help you determine what to log. An event that happens quite frequently is a message event. The message event includes an Importance value that is associated with it. Based on this and the verbosity, you can determine whether you would like to log the message. Now let s examine the second bullet point. What are some of the useful elements of different build event arg objects We noted previously that each event has its own distinct class, such as BuildStartedEventArgs or BuildMessageEventArgs. Each of these classes inherits from the abstract Microsoft.Build.Framework.BuildEventArgs class. This class has five public properties: Message, Timestamp, HelpKeyword, ThreadId, and SenderName. Most of the subclasses have some important properties that you can use in your loggers, as listed in Table 4-6. The names of the properties are self-descriptive. Table 4-6. Some Properties from the BuildEventArg Subclasses
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BuildErrorEventArgs BuildWarningEventArgs
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File Code ColumnNumber LineNumber HelpKeyword Importance ProjectFile ProjectFile TargetFile TargetName ProjectFile TaskName TaskFile Succeeded
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BuildMessageEventArgs ProjectStartedEventArgs ProjectFinishedEventArgs TargetStartedEventArgs TargetFinishedEventArgs TaskStartedEventArgs TaskFinishedEventArgs BuildFinishedEventArgs ProjectFinishedEventArgs TargetFinishedEventArgs TaskFinishedEventArgs
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If you are going to create your own events, then you will use the CustomEventRaised event and pass it a subclass of CustomBuildEventArgs. In this case you will know what extra information is contained in those classes.
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CHAPTER 4 EXTENDING MSBUILD
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Now that you know how to create a new MSBuild logger, you need to know how to deal with problems when they occur. If your logger is going to throw an exception, then it will not only fail the build but will also do so in an ugly fashion. When this happens, sometimes you may not even be given details about what went wrong. These problems can sometimes be difficult to locate. The method to deal with this is to catch exceptions that may be thrown and rethrow them as a Microsoft.Build.Framework.LoggerException; as a best practice when rethrowing exceptions, set the inner exception to the original one. The LoggerException is a special exception that MSBuild will handle differently from other exceptions, and it is the preferred mechanism to signal logger failures. When a LoggerException is raised, the build will still fail, but you will be provided with more details about why it failed. You can even specify an error code and keyword on the exception. This section has demonstrated how you can create your own MSBuild loggers. MSBuild loggers are easy to create and can be powerful. We have shown how to register for different event types, how to implement verbosity, and how to properly construct your loggers. If you still think that writing loggers can be difficult, all you have to do is implement one, and you ll be convinced otherwise. Now we will move forward with some other elements that are necessary for automated building. We will start with unit testing.
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Using NUnit and MSBuild
Visual Studio 2005 introduced a unit testing framework. This framework allows you to create and execute unit tests for your projects. This framework is included only in certain editions of Visual Studio; for more information about specific versions, see http://msdn.microsoft.com/ vstudio/. Because of this, we will not cover this framework; instead, we will cover the NUnit unit-testing package. NUnit is an open source unit-testing framework that is available at http://www.nunit.org. In this section, we will introduce NUnit, and we will provide an MSBuild task that can be used to examine assemblies and execute any NUnit test contained within them. We will assume that most readers have heard of unit testing and have even created some unit tests previously. Because of this, we will only briefly introduce unit testing and NUnit before we begin discussing how you can integrate it into your build process. Unit testing is a means to test a small component, or unit, of code. The idea behind a unit test is to write the test case and execute the tests alongside the build. Once you write a unit test that passes, it should continue to pass. Should it fail, you need to examine your changes, or perhaps the test case, for any harmful content.
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